Boiler.



No. 655,589. Patented Aug. 7, |900. G. S. STRUNG.

BUILER (Application filed Aug. 26, 1899.)

(No Model.) 4 Sheets-Sheet I.

Patented Aug. 7, |900.

G. S. STRONG.

B 0l L E R (Application med Aug. 2e, 1899.)

4 Sheets-Sheet 2,

(No Model.)

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Patented Aug. 7, |900. G. S. STRUNG. BUILER.

(Application led Aug. 26, 189

4 Sheets-Sheet 4.v

(No Model.)

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@witnesses 0701 THD WASHINGTON D L NITED STATES PATENT OFFICE.

GEORGE s. STRONG, or NEW YORK, N. Y.

BOILER.

SPECIFICATION forming part of Letters Patent No. 655,589, dated August 7, 1900.

Application tiled August 26, 1899. Serial No. 728x535- (N0 modem To all whom it may concern:

Beit known that I, GEORGE S. STRONG, a citizen of the United States of America, residing in the city and county of New York, in the State of New York,have invented cer. tain new and useful Improvements in Boilers, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to the construction of boilers having the general characteristics described and shown in my Patent No; 631,830, dated August 29, 1899.

The object of my invention is to improve upon the construction of my patented boiler, providing for a more energetic circulation of water in the boiler, for a stronger construction of the re-box portion of the boiler, for ready and convenient access to the tubes, and for the separation ofthe water from'the steam and prevention of an injurious amount of water in the steam-dome.

The nature of my improvements by which the above ends are secured will be best un` derstood as described in connection with the drawings, in which they are-illustrated, and in whichv f Figure l is a vertical longitudinal section through the center of the boiler, taken as on the line l l of Fig. 3. Fig. 2 is a view, ona larger scale, of a detail shown in Fig. l. Fig. 3 is a front view of the boiler, the portion to the left being shown with the shell of the firebox removed and the portion to the right being shownvin section on the line 3 3' of Fig. 4. Fig. 4 is a plan viewV taken on the irregular section-line 4 4 of Fig. 3. Fig. 5 is a longitudinal section through the end of one of the tubes and devices connected therewith, taken as on the line 5 5 of Fig. 6; and Fig. 6 is a cross-section through the tube, the portion to the left of the central line being shown on the section-line 6X 6X of Fig. 5 and the portionv to the right of the central line being shown on the line 6 6 of Fig. 5.

A and A' indicate the headers, between which the nre-box is situated and to the rear one of which, A', the boiler-shell D is secured, as shown. In my present construction l prefer to make the rear header of considerably-greater size than the front header, as is clearly shown in Figs. l and 3.

B B indicate two sets of water-tubes connecting the lateral sides of the front and rear headers and preferably inclined upward from the rear to the front header, as shown, to insure that the waterV will circulate freely from back to front through them. These tubes are preferably also arranged, as shown in Fig. 3, so that they arch over the grate and the bridge extending abovethe grate.

. cis a set of water and steam circulating tubes connecting the upper central portions of the front and rear headers and preferably set, as shown, so that they incline upwardly from the front to the rear. The inclined tubes care situated between the lateral tubes B B and lapped past them at the front of the ,fire-box, forming a lattice construction,which greatly increases the strength of the structure. The outer Walls or jacket of the fireboX is preferably formed, as shown, of a series of hollow tiles, as indicated at P, the openings being indicated at 1o, these tiles opening into the fire-box beneath the grate at Pand at some upper portion-for instance, at PS-opening to the atmosphere, so that an energetic circulation of air occurs through the openings p into the fire-box, serving the double purpose of supplying the fire-box with. heated air and of keeping the outer jacket of the fire-box comparatively cool.

J J, duc., indicate a water-tube grate, the tubes being connected with the headers, as shown, J J', dac., indicating rotatably-anchored bars situated between and below the water-tubes of the grate, by means of which the ashes are cut out and removed.

F F, dac., indicate a series of Water-tubes connected with the front and rear headers and extending across the iire-box, as shown, to afford supports for a forwardly and up- Wardly inclined bridge-Wall Gr, which extends over the rear part of the bridge and by means of which the products of combustion are forced forward in the fire-box before they can pass beyond and above the bridge into the combustion-chamber and fire-tubes of the boiler-shell, said combustion-chamber being indicated at E and the iire-tubes at E E.

I indicates a bridge or rear wall supported on the grate and reaching nearly but not quite to the under side of the bridge-wall G.

IOO

Back of this wall and opening into the firebox beneath the bridge-wallie an air and steam passage, (indicated at I',) I'l indicating a steam-pipe having openings along its top by which steam can be thrown into the passage I' and out through the nozzle I2 beneath the bridge-wall, and I3 indicating a damper for regulating the admission of air.

B3 indicates charging-doors opening into the furnace through the front header A.

v D, as before stated, is the boiler-shell connected with the rear header, D' being the steam-dome, secured to the top and sides of the front end of the boiler-shell D and also to a brace-plate (indicated at Q', Fig. l) and a downwardly-extending plate or plates, (indicated at Q,) said plate being inclined rearwardly and extending nearly but not quite to the normal water-line in the shell D. The function of this plate is to intercept the steam, largely mixed with water, coming from the tubes c, which open at or near the waterline and throw the water downward in contact with the water in the boiler-shell, with which it merges. Preferably I provide also a substantially horizontal and perforated plate (indicated at Q2) extending rearwardly from the lower edge of the plate Q and through the perforations in which the steam-escapes into the steam-space of the boiler. By preference I also supply a transversely-extending plate Q2, extending across the boiler-shell at the rear of the plate Q2 and serving as a swashplate, which in the starting and stopping of the engine prevents such surges of the water in the boiler as would be likely to throw it into the steam-dome D'.

In Figs. 4 and 5 I have illustrated the device which I-prefer to use in order to make the fire-box tubes readily accessible. Tubes (indicated in Figs. 5 and G at B) are expanded into the headers and have their ends (indicated at B2) open, but iinished so that the edges will lie in a plane perpendicular to the axis of the tube. Slots, as indicated at B', enable the tubes to communicate freely with the headers, into which they are expanded. R indicates a cap formed with an annular slot r, adapted to fit ,over the end B2 of a tube, said slot having, preferably, a copper gasket R' secured in its bottom. The cap R is made With a threaded perforation R2 on its inside and provided also with a head R2, adapted to give holdl to a wrench. S is a bolt having a threaded end S', adapted to be engaged by and screwed into the threaded perforation R2 in the cap, and the bolt is also provided with a laterally-extending hook end S2, which is adapted to engage the edge of one of the slots B'. Preferably I also secure a pivot-pin S3 in the bolt and pivot thereon asupplemental hook,(indicated at S) having, like the bolt S, a hooked end S2, which, how ever, is turned in the opposite direction to that of the bolt proper and adapted to engage the edge of the opposite slot B. By

preference I form this su pplemental hook S4 with laterally-projecting ears or lugs S5 and S6, by pushing against which from the open end of the tube the supplemental hook can be turned outward or inward, as may be desired.

The use of the hooked bolt and cap to close the end of the tube is simple and obvious. The hook or hooks S2 are engaged in the end of the slot and the cap then screwed on the threaded end of the bolt until it is drawn tight against the end of the tube and a good joint eected. When it is desired to get at the inside of the tube, the cap is unscrewed, the hooked bolt removed, and the tube is then freely open for cleaning purposes. Y

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A boiler having in combination front and rear headers, as A and A', between which the fire-chamber is situated, a set of water and steam tubes c connecting the central upper portions of the Vheaders and inclined upward from the front to the rear header, said tubes forming the top of the fire chamber, two sets of water-tubes B B connecting the lateral sides of the headers and forming the sides of the fire-chamber, said tubes being inclined downward from the front to the rear header and lapping part of the front ends of the tubes c so as to form a lattice-bracing for the fire-box and a capacious and 'energetic circulating device for the water, and a boiler shell secured to the rear header and having fire-tubes connecting with the fire-chamber.

2. A boiler having front and rear headers, as A A', between which the fire-chamber is situated and boiler-shell, as D, secured to the rear header, a set of water and steam tubes, as c, connecting the tops of the headers and forming the top of the fire-chamber, two sets of water-tubes, B B, connecting the lateral sides of the headers and forming the sides-of the re-chamber, and a deiiecting-plate Q se cured to the top of the boiler-shell D in frontI of the tubes c and extending nearly to th water-line.

3. A boiler having front and rear headers, as A A', between which the fire-chamber is situated and a boiler-shell, as D, secured to the rear header, a set of water and steam tubes, as c, connecting the tops of the headers and forming the top of the fire-chamber, two sets of water-tubes B B, connecting the lateral sides of the headers and forming the sides of the hre-chamber, a deliecting-plate Q secured to the top of the boiler-shell D in front of the tubes c and extending :nearly to the water-line, and a substantially-horizontal perforated plate Q2 extending back above the water-line from the lower edge of plate Q.

4. A boiler having front .and rear headers, as A A', between which the fire-chamber is situated and a boilershell, as D, secured to the rear header, a set of water and steam IOO tubes, as c, connecting the tops of the headers and forming the top of the fire-chamber, two sets of water-tubes, B B, connecting the lateral sides of the headers and forming the sides of the fire-chamber, a deflecting-plate Q secured to the top of the boiler-shell D in front of the tubes c and extending nearly to the water-line, a substantially-horizontal perforated plate Q2 extending back above the Water-line from the lower edge of plate Q and swash-plate Q3 secured across the boiler at the end of plate Q2.

5. Aboiler havin g in combination front and rear headers, as A and A', between which the lire-chamber is situated, a boiler-shell, as D, secured to and opening into the rear header, a set of water and steam tubes c connecting the central upper portions of the headers and inclined upward from the front to the rear header, said tubes forming the top of the tire'- chamber, two sets of water-tubes B B connecting the lateral sides of the headers and forming the sides of the rechamber, said tubes beinginclined downward from the front to the rear header and lapping past the front end of the tube c so as to form a lattice-bear ing for the tire-box and a capacious and energetic circulating device for the water, and a deiiecting-plate Q secured to the top of the boiler-shell D in front of the tube c and eX# tending nearly to the water-line. i

6. A boiler having in combination front and rear headers, as A and A', between which the fire-chamber is situated, a boiler-shell, as D, secured to and opening into the rear header, a set of water and steam tubes c connecting the central upper portion of the headers and inclined upward from the front to the rear header, said tubes forming the top of the lirechamber, two sets of water-tubes B B connecting the lateral sides of the headers and forming the sides of the fire-chamber said tubes beinginclined downward from the front to the rear header and lapping past the front end of the tubes c so as to form a lattice-brac-- ing for the fire-box and a capacious and energetic circulating device for the Water, a deflecting-plate Q secured to the top of the boiler-shell D in front of the tube c and eX- tending nearly to the Water-line, and a sub; stantially-horizontal perforated plate Q2 eX- tending back above the Water-line from the lower edge of plate Q.

GEORGE S. STRONG.

Witnessesi HENRY N. CONARD, D. STEWART. l 

